Rationally Speaking is the official podcast of New York City Skeptics. Join Julia Galefand guests as they explore the borderlands between reason and nonsense, likely and unlikely, science and pseudoscience. Rationally Speaking was co-created with Massimo Pigliucci, is produced by Benny Pollak and recorded in the heart of Greenwich Village.

Sean CarrollIn this episode of Rationally Speaking, Caltech physicist Sean Carroll describes an "embarrassing" state of affairs in modern physics: that we still don't know how to interpret quantum mechanics, almost a century after its discovery. Sean explains why he thinks the "Many Worlds Interpretation" (MWI) is the most plausible one we've got, and Julia explores his thoughts on questions like: Can MWI be tested? Is it "simpler" than other interpretations, and why? And does MWI threaten to destroy our systems of ethics?

Sean Michael Carroll is a research professor in the Department of Physics at the California Institute of Technology. He is a theoretical cosmologist specializing in dark energy and general relativity.

This live episode of Rationally Speaking, taped at the 2015 Northeast Conference on Science and Skepticism, is a special one: it's Massimo's last episode as co-host! He and Julia look back over their history together and discuss which topics they've changed their mind about since the podcast began.

James RandiThe Amazing Randi, famous magician and a pioneer of Skepticism, joins this episode of Rationally Speaking for a conversation about the past and future of the Skeptic movement. Massimo and Julia's questions for Randi include: Do you think Skepticism has shaped public opinion in any significant ways? What do you want the JREF to look like several years from now? And what have you changed your mind about, and why?